361616561 has 4 divisors (see below), whose sum is σ = 366709824. Its totient is φ = 356523300.

The previous prime is 361616539. The next prime is 361616609. The reversal of 361616561 is 165616163.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 361616561 - 2¹⁰ = 361615537 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (361616161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2546525 + ... + 2546666.

It is an arithmetic number, because the mean of its divisors is an integer number (91677456).

Almost surely, 2^361616561 is an apocalyptic number.

It is an amenable number.

361616561 is a deficient number, since it is larger than the sum of its proper divisors (5093263).

361616561 is an equidigital number, since it uses as much as digits as its factorization.

361616561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5093262.

The product of its digits is 19440, while the sum is 35.

The square root of 361616561 is about 19016.2183674883. The cubic root of 361616561 is about 712.4418738259.

The spelling of 361616561 in words is "three hundred sixty-one million, six hundred sixteen thousand, five hundred sixty-one".